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db/Interface: CollectUniqueTags() allows multiple "groups"

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Instead of passing tag and group, pass an array of tags.  To support a
nested return value, return a nested std::map of std::maps.  Each key
specifies the tag value, and each value may be another nesting level.

Closes https://github.com/MusicPlayerDaemon/MPD/issues/408
This commit is contained in:
Max Kellermann
2018-11-19 11:17:25 +01:00
committed by Max Kellermann
parent 923c1b6220
commit 1eae9339f2
12 changed files with 166 additions and 123 deletions
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5
src/db/plugins/simple/SimpleDatabasePlugin.hxx
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@@ -122,9 +122,8 @@ public:
VisitSong visit_song,
VisitPlaylist visit_playlist) const override;
std::map<std::string, std::set<std::string>> CollectUniqueTags(const DatabaseSelection &selection,
TagType tag_type,
TagType group) const override;
RecursiveMap<std::string> CollectUniqueTags(const DatabaseSelection &selection,
ConstBuffer<TagType> tag_types) const override;
DatabaseStats GetStats(const DatabaseSelection &selection) const override;